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UC3843AD

SMPS Controller

Partnumber Manufacturer Quantity Availability
UC3843AD 580 In Stock

Description and Introduction

SMPS Controller The UC3843AD is a high-performance current-mode PWM controller manufactured by Texas Instruments.  

### **Specifications:**  
- **Input Voltage Range:** 8.5V to 30V (start-up), 7.6V to 30V (operating)  
- **Output Frequency:** Up to 500 kHz  
- **Maximum Duty Cycle:** 100%  
- **Output Current (Peak):** ±1A (source/sink)  
- **Reference Voltage:** 5V ±1%  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** SOIC-8  

### **Description:**  
The UC3843AD is a fixed-frequency pulse-width modulation (PWM) controller designed for DC-DC converter applications. It features current-mode control for improved loop response and includes built-in protections such as under-voltage lockout (UVLO), cycle-by-cycle current limiting, and a programmable oscillator.  

### **Features:**  
- **Current-Mode Control:** Ensures cycle-by-cycle current limiting.  
- **Precision Reference:** 5V trimmed to ±1%.  
- **Under-Voltage Lockout (UVLO):** Ensures proper start-up and shutdown.  
- **Adjustable Oscillator Frequency:** Set by external components.  
- **Soft-Start Capability:** Reduces inrush current.  
- **High-Current Totem Pole Output:** Directly drives power MOSFETs.  

This information is based on the manufacturer's datasheet for the UC3843AD.

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